Plaster lath



Dec. 9, 1924- J. F. MAKOWSKI PLASTER LATH Filed March 5, 1 924 IN VEN TOR. (J 01712 1 1 Mexico wskl',

mm; ATTORNEY Patented Dec. 9, 1924.

UNITED STATES PATENT OFFICE.

JOHN F. MAKOWSKI, OF STOCKTON, CALIFORNIA, ASSIGNOB TO CALIFORNIA CEDAR PRODUCTS COMPANY, OF STOCKTON, CALIFORNIA, A CORPORATION.

rLAs'rER LATE.

Application filed March 5, 1924. Serial No. 697,050.

To all whom it may concern:

Be it known that I, JOHN F. MAKoWsKr, acitizen of the United States, residing at Stockton, county of San Joaquin, State of California, have invented certain new and useful Improvements in Plaster Laths; and

I do declare the following to be a full, clear,-

and exact description of the same, reference being had to the accompanying drawings, 1c and to the characters of reference marked thereon, which form apart of this application.

This invention relates to the building art and particularly to wall construction.

The object of the invention is to produce a plaster lath of the type described in my allowed application for patent, Serial-No. 608,595, the design of the present invention being to develop a very cheap form of lath which will find a ready demand due to the decreased cost thereof.

In developing a cheap lath however the fact must not be lost sight of that the lath must be impervious to moisture and the finely 26 divided mineral fragments must nevertheless be securely adhered to the surface of the base board. I believe that in the herein described form of lath I have accomplished both objects.

1 he drawing is a section of the plaster Referring to the numerals on the drawings, 1 designates the base board. Over the surface of the board I spread, by any suitable means, a-coating consisting of silicate of soda and water of a desired consistency. This silicate of soda provides a very cheap binder or adhesive for adhering the finely divided mineral fragments to the base board. 7

M It is not however impervious to moisture but is readily soluble. This would of course render the lath noncommercial.

Therefore, after the mineral fragments 3 are spread over the coating 2, I then spray the entire surface with a dilute solution of casein and lime. The lime acts as a temporary solvent for the casein.

When the entire board dries the silicate of soda, as indicated, forms a cheap and efficient binder for the mineral fragments. The

casein, after drying, forms an insoluble.

water proof coating 4 over the surface of the lath. Thus I am enabled to produce a cheap lath and yet one which is water proof and therefore usable commercially.

I have iven herein the preferred embodiment of t e invention. However, such deviations therefrom may be made as may fall within the scope of the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A plaster lath comprising a base, a coating of silicate of soda over the surface of the base, finely divided mineral fragments adhered to the base, and an insoluble coating over the surface of the lath.

2. A plaster lath comprising a base, a coating of silicate of soda over the surface of the base, finely divided mineral fragments adhered to the base, and a coating over the surface of the lath consisting essentially of casein. y 3. In a plaster lath of the type set forth in which the finely divided mineral fragment are adhered to the base by a soluble binder, of a coating of insoluble material spread over the surface of the lath.

In testimony whereof I aflix m signature.

JOHN F. MA OWSKI. 

